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data-v-22052bdb><!--[--><!--]--><span id="sidebar-aria-label" class="visually-hidden" data-v-22052bdb>Sidebar Navigation</span><!--[--><div class="group" data-v-22052bdb><section class="VPSidebarGroup" data-v-22052bdb data-v-59eaa146><div class="title" data-v-59eaa146><h2 class="active title-text" data-v-59eaa146>mysql</h2></div><!--[--><a class="link" href="/mysql/01.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>01 【数据库概述】</p></a><a class="link active" href="/mysql/02.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>02 【MySQL基本使用】</p></a><a class="link" href="/mysql/03.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>03 【基本的SELECT语句】</p></a><a class="link" href="/mysql/04.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>04 【运算符】</p></a><a class="link" href="/mysql/05.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>05 【排序与分页】</p></a><a class="link" href="/mysql/06.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>06 【多表查询】</p></a><a class="link" href="/mysql/07.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>07 【单行函数】</p></a><a class="link" href="/mysql/08.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>08 【聚合函数与分组查询】</p></a><a class="link" href="/mysql/09.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>09 【子查询】</p></a><a class="link" href="/mysql/10.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>10 【创建和管理表】</p></a><a class="link" href="/mysql/11.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>11 【数据处理之增删改】</p></a><!--]--></section></div><!--]--><!--[--><!--]--></nav></aside><div id="VPContent" class="VPContent has-sidebar" data-v-23306c50 data-v-790151bc><div class="VPContentDoc has-aside has-sidebar" data-v-790151bc data-v-4fe9b7bd><div class="container" data-v-4fe9b7bd><div class="aside" data-v-4fe9b7bd><div class="aside-container" data-v-4fe9b7bd><!--[--><!--]--><div class="VPContentDocOutline" data-v-4fe9b7bd data-v-aa0e2252><div class="outline-marker" data-v-aa0e2252></div><div class="outline-title" data-v-aa0e2252>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-aa0e2252><span id="doc-outline-aria-label" class="visually-hidden" data-v-aa0e2252>Table of Contents for current page</span><ul class="root" data-v-aa0e2252><!--[--><li style="" data-v-aa0e2252><a class="outline-link" href="#_1-自带客户端的登录与退出" data-v-aa0e2252>1.自带客户端的登录与退出</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_2-mysql演示使用" data-v-aa0e2252>2.MySQL演示使用</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_3-mysql-目录结构" data-v-aa0e2252>3.MySQL 目录结构</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_4-常见问题的解决-课外内容" data-v-aa0e2252>4.常见问题的解决(课外内容)</a><!----></li><!--]--></ul></nav></div><!--[--><!--[--><!--[--><div><a class="sponsors-aside-text" href="/">联系客服</a><img src="/images/qrcode.png"></div><!--]--><!--]--><!--]--><div class="VPCarbonAds" data-v-4fe9b7bd><img src="/logo.svg" alt="" srcset=""></div><!--[--><!--[--><!--[--><h1 class="tagline" data-v-3916b2f0><span class="accent" data-v-3916b2f0>Bin</span><br data-v-3916b2f0>QQ - 1974892005 </h1><!--]--><!--]--><!--]--></div></div><div class="content" data-v-4fe9b7bd><!--[--><!--]--><main data-v-4fe9b7bd><div style="position:relative;" class="vt-doc mysql" data-v-4fe9b7bd><div><h1 id="_02-【mysql基本使用】" tabindex="-1">02 【MySQL基本使用】 <a class="header-anchor" href="#_02-【mysql基本使用】" aria-hidden="true">#</a></h1><h2 id="_1-自带客户端的登录与退出" tabindex="-1">1.自带客户端的登录与退出 <a class="header-anchor" href="#_1-自带客户端的登录与退出" aria-hidden="true">#</a></h2><p>当MySQL服务启动完成后，便可以通过客户端来登录MySQL数据库。注意：确认服务是开启的。</p><h3 id="_1-1-登录方式1：mysql自带客户端" tabindex="-1">1.1 登录方式1：MySQL自带客户端 <a class="header-anchor" href="#_1-1-登录方式1：mysql自带客户端" aria-hidden="true">#</a></h3><p>开始菜单 → 所有程序 → MySQL → MySQL 8.0 Command Line Client</p><p><img src="https://i0.hdslb.com/bfs/album/82c689a49082ee2597de8dd3e4c9b384d247ac6f.png" alt=""></p><blockquote><p>说明：仅限于root用户</p></blockquote><h3 id="_1-2-登录方式2：windows命令行" tabindex="-1">1.2 登录方式2：windows命令行 <a class="header-anchor" href="#_1-2-登录方式2：windows命令行" aria-hidden="true">#</a></h3><ul><li>格式：</li></ul><div class="language-css line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql -h 主机名 -P 端口号 -u 用户名 -p密码</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>举例：</li></ul><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">h localhost </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">P </span><span style="color:#F78C6C;">3306</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">u </span><span style="color:#F78C6C;">root</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">p123456  # 这里我设置的root用户的密码是123456</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><img src="https://i0.hdslb.com/bfs/album/434a200e01b500a234ef8dd25c2f2058338525cb.png" alt=""></p><p>注意：</p><p>（1）-p与密码之间不能有空格，其他参数名与参数值之间可以有空格也可以没有空格。如：</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">h localhost </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">P3306 </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">uroot </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">p123456</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>（2）密码建议在下一行输入，保证安全</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">h localhost </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">P </span><span style="color:#F78C6C;">3306</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">u </span><span style="color:#F78C6C;">root</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">p</span></span>
<span class="line"><span style="color:#A6ACCD;">Enter </span><span style="color:#F78C6C;">password</span><span style="color:#A6ACCD;">:</span><span style="color:#89DDFF;">****</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>（3）客户端和服务器在同一台机器上，所以输入localhost或者IP地址127.0.0.1。同时，因为是连接本机：-hlocalhost就可以省略，如果端口号没有修改：-P3306也可以省略</p><p>简写成：</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">u </span><span style="color:#F78C6C;">root</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;">p</span></span>
<span class="line"><span style="color:#A6ACCD;">Enter </span><span style="color:#F78C6C;">password</span><span style="color:#A6ACCD;">:</span><span style="color:#89DDFF;">****</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>连接成功后，有关于MySQL Server服务版本的信息，还有第几次连接的id标识。</p><p>也可以在命令行通过以下方式获取MySQL Server服务版本的信息：</p><div class="language-makefile line-numbers-mode"><pre><code><span class="line"><span style="color:#82AAFF;">c</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;">\&gt; mysql -V</span></span>
<span class="line"><span style="color:#82AAFF;">c</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;">\&gt; mysql --version</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>或<strong>登录</strong>后，通过以下方式查看当前版本信息：</p><div class="language-csharp line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">select</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">version</span><span style="color:#89DDFF;">();</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>1.3 退出登录</p><div class="language-bash line-numbers-mode"><pre><code><span class="line"><span style="color:#82AAFF;">exit</span></span>
<span class="line"><span style="color:#A6ACCD;">或</span></span>
<span class="line"><span style="color:#A6ACCD;">quit</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="_2-mysql演示使用" tabindex="-1">2.MySQL演示使用 <a class="header-anchor" href="#_2-mysql演示使用" aria-hidden="true">#</a></h2><h3 id="_2-1-mysql的使用演示" tabindex="-1">2.1 MySQL的使用演示 <a class="header-anchor" href="#_2-1-mysql的使用演示" aria-hidden="true">#</a></h3><p>1、查看所有的数据库</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">show databases;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><blockquote><p>“information_schema”是 MySQL 系统自带的数据库，主要保存 MySQL 数据库服务器的系统信息，比如数据库的名称、数据表的名称、字段名称、存取权限、数据文件 所在的文件夹和系统使用的文件夹，等等</p><p>“performance_schema”是 MySQL 系统自带的数据库，可以用来监控 MySQL 的各类性能指标。</p><p>“sys”数据库是 MySQL 系统自带的数据库，主要作用是以一种更容易被理解的方式展示 MySQL 数据库服务器的各类性能指标，帮助系统管理员和开发人员监控 MySQL 的技术性能。</p><p>“mysql”数据库保存了 MySQL 数据库服务器运行时需要的系统信息，比如数据文件夹、当前使用的字符集、约束检查信息，等等</p></blockquote><p>为什么 Workbench 里面我们只能看到“demo”和“sys”这 2 个数据库呢？</p><p>这是因为，Workbench 是图形化的管理工具，主要面向开发人 员，“demo”和“sys”这 2 个数据库已经够用了。如果有特殊需求，比如，需要监控 MySQL 数据库各项性能指标、直接操作 MySQL 数据库系统文件等，可以由 DBA 通过 SQL 语句，查看其它的系统数据库。</p><p>2、创建自己的数据库</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> 数据库名;</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">#创建atguigudb数据库，该名称不能与已经存在的数据库重名。</span></span>
<span class="line"><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> atguigudb;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>3、使用自己的数据库</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#F78C6C;">use</span><span style="color:#A6ACCD;"> 数据库名;</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">#使用atguigudb数据库</span></span>
<span class="line"><span style="color:#F78C6C;">use</span><span style="color:#A6ACCD;"> atguigudb;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>说明：如果没有使用use语句，后面针对数据库的操作也没有加“数据名”的限定，那么会报“ERROR 1046 (3D000): No database selected”（没有选择数据库）</p><p>使用完use语句之后，如果接下来的SQL都是针对一个数据库操作的，那就不用重复use了，如果要针对另一个数据库操作，那么要重新use。</p><p>4、查看某个库的所有表格</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">show tables;  #要求前面有use语句</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">show tables </span><span style="color:#F78C6C;">from</span><span style="color:#A6ACCD;"> 数据库名;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>5、创建新的表格</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> 表名称(</span></span>
<span class="line"><span style="color:#A6ACCD;">	字段名  数据类型,</span></span>
<span class="line"><span style="color:#A6ACCD;">	字段名 数据类型</span></span>
<span class="line"><span style="color:#A6ACCD;">);</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>说明：如果是最后一个字段，后面就用加逗号，因为逗号的作用是分割每个字段。</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">#创建学生表</span></span>
<span class="line"><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student(</span></span>
<span class="line"><span style="color:#A6ACCD;">	id </span><span style="color:#F78C6C;">int</span><span style="color:#A6ACCD;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#F78C6C;">name</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">varchar</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">20</span><span style="color:#A6ACCD;">)  #说名字最长不超过20个字符</span></span>
<span class="line"><span style="color:#A6ACCD;">);</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>6、查看一个表的数据：<code>select * from 数据库表名称;</code></p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">#查看学生表的数据</span></span>
<span class="line"><span style="color:#F78C6C;">select</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">from</span><span style="color:#A6ACCD;"> student;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>7、添加一条记录</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#F78C6C;">insert</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">into</span><span style="color:#A6ACCD;"> 表名称 </span><span style="color:#F78C6C;">values</span><span style="color:#A6ACCD;">(值列表);</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">#添加两条记录到student表中</span></span>
<span class="line"><span style="color:#F78C6C;">insert</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">into</span><span style="color:#A6ACCD;"> student </span><span style="color:#F78C6C;">values</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">张三</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">);</span></span>
<span class="line"><span style="color:#F78C6C;">insert</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">into</span><span style="color:#A6ACCD;"> student </span><span style="color:#F78C6C;">values</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">2</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">李四</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">);</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>报错：</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">insert</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">into</span><span style="color:#A6ACCD;"> student </span><span style="color:#F78C6C;">values</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">张三</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">);</span></span>
<span class="line"><span style="color:#A6ACCD;">ERROR </span><span style="color:#F78C6C;">1366</span><span style="color:#A6ACCD;"> (HY000): Incorrect string </span><span style="color:#F78C6C;">value</span><span style="color:#A6ACCD;">: </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">\xD5\xC5\xC8\xFD</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> for column </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">name</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">at</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">insert</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">into</span><span style="color:#A6ACCD;"> student </span><span style="color:#F78C6C;">values</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">2</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">李四</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">);</span></span>
<span class="line"><span style="color:#A6ACCD;">ERROR </span><span style="color:#F78C6C;">1366</span><span style="color:#A6ACCD;"> (HY000): Incorrect string </span><span style="color:#F78C6C;">value</span><span style="color:#A6ACCD;">: </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">\xC0\xEE\xCB\xC4</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> for column </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">name</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">at</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>字符集的问题。</p><p>8、查看表的创建信息：<code>show create table 表名称\G</code></p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">#查看student表的详细创建信息</span></span>
<span class="line"><span style="color:#A6ACCD;">show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student\G</span></span>
<span class="line"><span style="color:#A6ACCD;">#结果如下</span></span>
<span class="line"><span style="color:#89DDFF;">***************************</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">. </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">***************************</span></span>
<span class="line"><span style="color:#A6ACCD;">       </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: student</span></span>
<span class="line"><span style="color:#F78C6C;">Create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: </span><span style="color:#F78C6C;">CREATE</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">TABLE</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">student</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> (</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">id</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">int</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">11</span><span style="color:#A6ACCD;">) </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span><span style="color:#A6ACCD;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">name</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">varchar</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">20</span><span style="color:#A6ACCD;">) </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span></span>
<span class="line"><span style="color:#A6ACCD;">) ENGINE</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">InnoDB </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> CHARSET</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">latin1</span></span>
<span class="line"><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">in</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">set</span><span style="color:#A6ACCD;"> (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>上面的结果显示student的表格的默认字符集是“latin1”不支持中文。</p><p>9、查看数据库的创建信息：<code>show create database 数据库名\G</code></p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">#查看atguigudb数据库的详细创建信息</span></span>
<span class="line"><span style="color:#A6ACCD;">show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> atguigudb\G</span></span>
<span class="line"><span style="color:#A6ACCD;">#结果如下</span></span>
<span class="line"><span style="color:#89DDFF;">***************************</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">. </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">***************************</span></span>
<span class="line"><span style="color:#A6ACCD;">       </span><span style="color:#F78C6C;">Database</span><span style="color:#A6ACCD;">: atguigudb</span></span>
<span class="line"><span style="color:#F78C6C;">Create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">Database</span><span style="color:#A6ACCD;">: </span><span style="color:#F78C6C;">CREATE</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">DATABASE</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">atguigudb</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#676E95;font-style:italic;">/*!40100 DEFAULT CHARACTER SET latin1 */</span></span>
<span class="line"><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">in</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">set</span><span style="color:#A6ACCD;"> (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>上面的结果显示atguigudb数据库也不支持中文，字符集默认是latin1。</p><p>10、删除表格：<code>drop table 表名称;</code></p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">#删除学生表</span></span>
<span class="line"><span style="color:#F78C6C;">drop</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>11、删除数据库：<code>drop database 数据库名;</code></p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">#删除atguigudb数据库</span></span>
<span class="line"><span style="color:#F78C6C;">drop</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> atguigudb;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="_2-2-mysql4的编码设置" tabindex="-1">2.2 MySQL4的编码设置 <a class="header-anchor" href="#_2-2-mysql4的编码设置" aria-hidden="true">#</a></h3><h4 id="_2-2-1-mysql5-7中" tabindex="-1">2.2.1 MySQL5.7中 <a class="header-anchor" href="#_2-2-1-mysql5-7中" aria-hidden="true">#</a></h4><p><strong>问题再现：命令行操作sql乱码问题</strong></p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">INSERT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">INTO</span><span style="color:#A6ACCD;"> t_stu </span><span style="color:#F78C6C;">VALUES</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">张三</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">男</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">);</span></span>
<span class="line"><span style="color:#A6ACCD;">ERROR </span><span style="color:#F78C6C;">1366</span><span style="color:#A6ACCD;"> (HY000): Incorrect string </span><span style="color:#F78C6C;">value</span><span style="color:#A6ACCD;">: </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">\xD5\xC5\xC8\xFD</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> for column </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">sname</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">at</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p><strong>问题解决</strong></p><p>步骤1：查看编码命令</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">show variables </span><span style="color:#F78C6C;">like</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">character_%</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">show variables </span><span style="color:#F78C6C;">like</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">collation_%</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>步骤2：修改mysql的数据目录下的my.ini配置文件</p><div class="language-ini line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;">[mysql]</span><span style="color:#A6ACCD;">  </span><span style="color:#676E95;font-style:italic;">#大概在63行左右，在其下添加</span></span>
<span class="line"><span style="color:#A6ACCD;">... </span></span>
<span class="line"><span style="color:#F07178;">default-character-set</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">utf8  </span><span style="color:#676E95;font-style:italic;">#默认字符集</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#89DDFF;">[mysqld]</span><span style="color:#A6ACCD;">  </span><span style="color:#676E95;font-style:italic;"># 大概在76行左右，在其下添加</span></span>
<span class="line"><span style="color:#A6ACCD;">...</span></span>
<span class="line"><span style="color:#F07178;">character-set-server</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">utf8</span></span>
<span class="line"><span style="color:#F07178;">collation-server</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">utf8_general_ci</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><blockquote><p>注意：建议修改配置文件使用notepad++等高级文本编辑器，使用记事本等软件打开修改后可能会导致文件编码修改为“含BOM头”的编码，从而服务重启失败。</p></blockquote><p>步骤3：重启服务</p><p>步骤4：查看编码命令</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">show variables </span><span style="color:#F78C6C;">like</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">character_%</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">show variables </span><span style="color:#F78C6C;">like</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">collation_%</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p><img src="https://i0.hdslb.com/bfs/album/d0e37285c4b2fc8d083ccd3322d2d7884b3aa3fc.png" alt=""></p><p><img src="https://i0.hdslb.com/bfs/album/e1aabe9dc98c6f8a472a9500c6ac6ad13fefd484.png" alt=""></p><p>如果是以上配置就说明对了。接着我们就可以新创建数据库、新创建数据表，接着添加包含中文的数据了。</p><h4 id="_2-2-2-mysql8-0中" tabindex="-1">2.2.2 MySQL8.0中 <a class="header-anchor" href="#_2-2-2-mysql8-0中" aria-hidden="true">#</a></h4><p>在MySQL 8.0版本之前，默认字符集为latin1，utf8字符集指向的是utf8mb3。网站开发人员在数据库设计的时候往往会将编码修改为utf8字符集。如果遗忘修改默认的编码，就会出现乱码的问题。从MySQL 8.0开始，数据库的默认编码改为<code>utf8mb4</code>，从而避免了上述的乱码问题。</p><h2 id="_3-mysql-目录结构" tabindex="-1">3.MySQL 目录结构 <a class="header-anchor" href="#_3-mysql-目录结构" aria-hidden="true">#</a></h2><table><thead><tr><th>MySQL的目录结构</th><th>说明</th></tr></thead><tbody><tr><td>bin目录</td><td>所有MySQL的可执行文件。如：mysql.exe</td></tr><tr><td>MySQLInstanceConfig.exe</td><td>数据库的配置向导，在安装时出现的内容</td></tr><tr><td>data目录</td><td>系统数据库所在的目录</td></tr><tr><td>my.ini文件</td><td>MySQL的主要配置文件</td></tr><tr><td>c:\ProgramData\MySQL\MySQL Server 8.0\data\</td><td>用户创建的数据库所在的目录</td></tr></tbody></table><h2 id="_4-常见问题的解决-课外内容" tabindex="-1">4.常见问题的解决(课外内容) <a class="header-anchor" href="#_4-常见问题的解决-课外内容" aria-hidden="true">#</a></h2><h3 id="_4-1-问题1：root用户密码忘记，重置的操作" tabindex="-1">4.1 问题1：root用户密码忘记，重置的操作 <a class="header-anchor" href="#_4-1-问题1：root用户密码忘记，重置的操作" aria-hidden="true">#</a></h3><p>1: 通过任务管理器或者服务管理，关掉mysqld(服务进程) 2: 通过命令行+特殊参数开启mysqld</p><div class="language-bash line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysqld --defaults-file=</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">D:\ProgramFiles\mysql\MySQLServer5.7Data\my.ini</span><span style="color:#89DDFF;">&quot;</span><span style="color:#A6ACCD;"> --skip-grant-tables</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>3: 此时，mysqld服务进程已经打开。并且不需要权限检查 4: mysql -uroot 无密码登陆服务器。另启动一个客户端进行 5: 修改权限表</p><div class="language-bash line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">（1）use mysql</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">（2）update user </span><span style="color:#82AAFF;">set</span><span style="color:#A6ACCD;"> authentication_string=password</span><span style="color:#89DDFF;">(</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">新密码</span><span style="color:#89DDFF;">&#39;</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> where user=</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">root</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> and Host=</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">localhost</span><span style="color:#89DDFF;">&#39;</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">（3）flush privileges</span><span style="color:#89DDFF;">;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>6: 通过任务管理器，关掉mysqld服务进程。 7: 再次通过服务管理，打开mysql服务。 8: 即可用修改后的新密码登陆。</p><h3 id="_4-2-问题2：mysql命令报“不是内部或外部命令”" tabindex="-1">4.2 问题2：mysql命令报“不是内部或外部命令” <a class="header-anchor" href="#_4-2-问题2：mysql命令报“不是内部或外部命令”" aria-hidden="true">#</a></h3><p>如果输入mysql命令报“不是内部或外部命令”，把mysql安装目录的bin目录配置到环境变量path中。如下：</p><p><img src="https://i0.hdslb.com/bfs/album/c615c24cc400b14c19ef37f2d0604236fced5dcb.png" alt=""></p><h3 id="_4-3-问题3：错误error-：没有选择数据库就操作表格和数据" tabindex="-1">4.3 问题3：错误ERROR ：没有选择数据库就操作表格和数据 <a class="header-anchor" href="#_4-3-问题3：错误error-：没有选择数据库就操作表格和数据" aria-hidden="true">#</a></h3><table><thead><tr><th>ERROR 1046 (3D000): No database selected</th></tr></thead><tbody><tr><td>解决方案一：就是使用“USE 数据库名;”语句，这样接下来的语句就默认针对这个数据库进行操作</td></tr><tr><td>解决方案二：就是所有的表对象前面都加上“数据库.”</td></tr></tbody></table><h3 id="_4-4-问题4：命令行客户端的字符集问题" tabindex="-1">4.4 问题4：命令行客户端的字符集问题 <a class="header-anchor" href="#_4-4-问题4：命令行客户端的字符集问题" aria-hidden="true">#</a></h3><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">INSERT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">INTO</span><span style="color:#A6ACCD;"> t_stu </span><span style="color:#F78C6C;">VALUES</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">张三</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">,</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">男</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">);</span></span>
<span class="line"><span style="color:#A6ACCD;">ERROR </span><span style="color:#F78C6C;">1366</span><span style="color:#A6ACCD;"> (HY000): Incorrect string </span><span style="color:#F78C6C;">value</span><span style="color:#A6ACCD;">: </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">\xD5\xC5\xC8\xFD</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> for column </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">sname</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">at</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>原因：服务器端认为你的客户端的字符集是utf-8，而实际上你的客户端的字符集是GBK。</p><p><img src="https://i0.hdslb.com/bfs/album/62c5f66eb77ab7882522d0dc638a5033d843da1e.png" alt=""></p><p>查看所有字符集：<strong>SHOW VARIABLES LIKE &#39;character_set_%&#39;;</strong></p><p><img src="https://i0.hdslb.com/bfs/album/e6007ba33b2e192ca445040a52637989142bae61.png" alt=""></p><p>解决方案，设置当前连接的客户端字符集 <strong>“SET NAMES GBK;”</strong></p><p><img src="https://i0.hdslb.com/bfs/album/edeecff4efd2616f6c0a3e435187e6983b0b6284.png" alt=""></p><h3 id="_4-5-问题5：修改数据库和表的字符编码" tabindex="-1">4.5 问题5：修改数据库和表的字符编码 <a class="header-anchor" href="#_4-5-问题5：修改数据库和表的字符编码" aria-hidden="true">#</a></h3><p>修改编码：</p><p>（1)先停止服务，（2）修改my.ini文件（3）重新启动服务</p><p>说明：</p><p>如果是在修改my.ini之前建的库和表，那么库和表的编码还是原来的Latin1，要么删了重建，要么使用alter语句修改编码。</p><div class="language-sql line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> 0728db charset Latin1;</span></span>
<span class="line"><span style="color:#A6ACCD;">Query OK, </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> affected (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">use</span><span style="color:#A6ACCD;"> 0728db;</span></span>
<span class="line"><span style="color:#F78C6C;">Database</span><span style="color:#A6ACCD;"> changed</span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student (id </span><span style="color:#F78C6C;">int</span><span style="color:#A6ACCD;"> , </span><span style="color:#F78C6C;">name</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">varchar</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">20</span><span style="color:#A6ACCD;">)) charset Latin1;</span></span>
<span class="line"><span style="color:#A6ACCD;">Query OK, </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">rows</span><span style="color:#A6ACCD;"> affected (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">02</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student\G</span></span>
<span class="line"><span style="color:#89DDFF;">***************************</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">. </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">***************************</span></span>
<span class="line"><span style="color:#A6ACCD;">       </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: student</span></span>
<span class="line"><span style="color:#F78C6C;">Create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: </span><span style="color:#F78C6C;">CREATE</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">TABLE</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">student</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> (</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">id</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">int</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">11</span><span style="color:#A6ACCD;">) </span><span style="color:#F78C6C;">NOT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span><span style="color:#A6ACCD;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">name</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">varchar</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">20</span><span style="color:#A6ACCD;">) </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span><span style="color:#A6ACCD;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#F78C6C;">PRIMARY</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">KEY</span><span style="color:#A6ACCD;"> (</span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">id</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"><span style="color:#A6ACCD;">) ENGINE</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">InnoDB </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> CHARSET</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">latin1</span></span>
<span class="line"><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">in</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">set</span><span style="color:#A6ACCD;"> (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">alter</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student charset utf8; #修改表字符编码为UTF8</span></span>
<span class="line"><span style="color:#A6ACCD;">Query OK, </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">rows</span><span style="color:#A6ACCD;"> affected (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">01</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;">Records: </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">  Duplicates: </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">  Warnings: </span><span style="color:#F78C6C;">0</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student\G</span></span>
<span class="line"><span style="color:#89DDFF;">***************************</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">. </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">***************************</span></span>
<span class="line"><span style="color:#A6ACCD;">       </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: student</span></span>
<span class="line"><span style="color:#F78C6C;">Create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: </span><span style="color:#F78C6C;">CREATE</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">TABLE</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">student</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> (</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">id</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">int</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">11</span><span style="color:#A6ACCD;">) </span><span style="color:#F78C6C;">NOT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span><span style="color:#A6ACCD;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">name</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">varchar</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">20</span><span style="color:#A6ACCD;">) </span><span style="color:#F78C6C;">CHARACTER</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">SET</span><span style="color:#A6ACCD;"> latin1 </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span><span style="color:#A6ACCD;">,  #字段仍然是latin1编码</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#F78C6C;">PRIMARY</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">KEY</span><span style="color:#A6ACCD;"> (</span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">id</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"><span style="color:#A6ACCD;">) ENGINE</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">InnoDB </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> CHARSET</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">utf8</span></span>
<span class="line"><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">in</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">set</span><span style="color:#A6ACCD;"> (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">alter</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student </span><span style="color:#F78C6C;">modify</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">name</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">varchar</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">20</span><span style="color:#A6ACCD;">) charset utf8; #修改字段字符编码为UTF8</span></span>
<span class="line"><span style="color:#A6ACCD;">Query OK, </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">rows</span><span style="color:#A6ACCD;"> affected (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">05</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;">Records: </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">  Duplicates: </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">  Warnings: </span><span style="color:#F78C6C;">0</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">table</span><span style="color:#A6ACCD;"> student\G</span></span>
<span class="line"><span style="color:#89DDFF;">***************************</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">. </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">***************************</span></span>
<span class="line"><span style="color:#A6ACCD;">       </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: student</span></span>
<span class="line"><span style="color:#F78C6C;">Create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">Table</span><span style="color:#A6ACCD;">: </span><span style="color:#F78C6C;">CREATE</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">TABLE</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">student</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> (</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">id</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">int</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">11</span><span style="color:#A6ACCD;">) </span><span style="color:#F78C6C;">NOT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span><span style="color:#A6ACCD;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">name</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">varchar</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">20</span><span style="color:#A6ACCD;">) </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">NULL</span><span style="color:#A6ACCD;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#F78C6C;">PRIMARY</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">KEY</span><span style="color:#A6ACCD;"> (</span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">id</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"><span style="color:#A6ACCD;">) ENGINE</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">InnoDB </span><span style="color:#C792EA;">DEFAULT</span><span style="color:#A6ACCD;"> CHARSET</span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;">utf8</span></span>
<span class="line"><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">in</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">set</span><span style="color:#A6ACCD;"> (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> 0728db;;</span></span>
<span class="line"><span style="color:#89DDFF;">+</span><span style="color:#676E95;font-style:italic;">--------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#A6ACCD;">|</span><span style="color:#F78C6C;">Database</span><span style="color:#A6ACCD;">| </span><span style="color:#F78C6C;">Create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">Database</span><span style="color:#A6ACCD;">                                                 |</span></span>
<span class="line"><span style="color:#89DDFF;">+</span><span style="color:#676E95;font-style:italic;">------+-------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#A6ACCD;">|0728db| </span><span style="color:#F78C6C;">CREATE</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">DATABASE</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">0728db</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#676E95;font-style:italic;">/*!40100 DEFAULT CHARACTER SET latin1 */</span><span style="color:#A6ACCD;"> |</span></span>
<span class="line"><span style="color:#89DDFF;">+</span><span style="color:#676E95;font-style:italic;">------+-------------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">in</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">set</span><span style="color:#A6ACCD;"> (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">alter</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> 0728db charset utf8; #修改数据库的字符编码为utf8</span></span>
<span class="line"><span style="color:#A6ACCD;">Query OK, </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> affected (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;"> </span></span>
<span class="line"><span style="color:#A6ACCD;">mysql</span><span style="color:#89DDFF;">&gt;</span><span style="color:#A6ACCD;"> show </span><span style="color:#F78C6C;">create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">database</span><span style="color:#A6ACCD;"> 0728db;</span></span>
<span class="line"><span style="color:#89DDFF;">+</span><span style="color:#676E95;font-style:italic;">--------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#A6ACCD;">|</span><span style="color:#F78C6C;">Database</span><span style="color:#A6ACCD;">| </span><span style="color:#F78C6C;">Create</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">Database</span><span style="color:#A6ACCD;">                                                 |</span></span>
<span class="line"><span style="color:#89DDFF;">+</span><span style="color:#676E95;font-style:italic;">--------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#A6ACCD;">| 0728db | </span><span style="color:#F78C6C;">CREATE</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">DATABASE</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">`</span><span style="color:#C3E88D;">0728db</span><span style="color:#89DDFF;">`</span><span style="color:#A6ACCD;"> </span><span style="color:#676E95;font-style:italic;">/*!40100 DEFAULT CHARACTER SET utf8 */</span><span style="color:#A6ACCD;"> |</span></span>
<span class="line"><span style="color:#89DDFF;">+</span><span style="color:#676E95;font-style:italic;">--------+-----------------------------------------------------------------+</span></span>
<span class="line"><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">row</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">in</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">set</span><span style="color:#A6ACCD;"> (</span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">.</span><span style="color:#F78C6C;">00</span><span style="color:#A6ACCD;"> sec)</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br></div></div></div></div><!----></main><!--[--><!--]--><footer class="VPContentDocFooter" data-v-4fe9b7bd data-v-7f892bef><a class="prev-link" href="/mysql/01.html" data-v-7f892bef><span class="desc" data-v-7f892bef><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="vt-link-icon" data-v-7f892bef><path d="M15,19c-0.3,0-0.5-0.1-0.7-0.3l-6-6c-0.4-0.4-0.4-1,0-1.4l6-6c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4L10.4,12l5.3,5.3c0.4,0.4,0.4,1,0,1.4C15.5,18.9,15.3,19,15,19z"></path></svg> Previous</span><span class="title" data-v-7f892bef>01 【数据库概述】</span></a><a class="next-link" href="/mysql/03.html" data-v-7f892bef><span class="desc" data-v-7f892bef>Next <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="vt-link-icon" data-v-7f892bef><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></span><span class="title" data-v-7f892bef>03 【基本的SELECT语句】</span></a></footer></div></div></div></div><div class="visually-hidden" aria-live="polite" data-v-23306c50>02 【MySQL基本使用】 has loaded</div></div></div>
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